Improvement in steam-gauges



icird gitarre gaat can.

WILLIAM CHESLE'Y, OF CINCINNATI, OHIO.

Leners Patent No. 95,323, dated satema 2s, 1869,

IMPROVEMENT 1N STEAM-Generis;

The Schedule referred to in those Letters Patent and making part of the same.

' To whom it may concern Beit known that I, WILLIAM GHEsLnY, of Cineinnati, in the county'of Hamilton, and State of Ohio,

arrangement of the margin ofthe diaphragms and of the gripping-surfaces of the containinglead or charnber, which combine great security, eiciency, and conr-k pactness with economy of labor andmaterial; and

secondly, to a device for regulating the dial-works, so as to correct either too long or too short a rangeof the needle.

Figure lis an axial section of asteam-gau'ge embodying my improvements. i

Figure 2 is a perspective view of several members of the same detached. 1

Figure 3 is a section taken 'in the plane offmy setting or adjusting-serews; v

, A represents the base' or cup of my confining-head, or chamber, and B, the cap or crown thereof. l Y

These two members lhave heretofore beenJalways either vboth of, brass or some other one metal, but for au advantage purely incidental to my construction,

` and which will presently appear, I prefer to make my base of cast-iron, and my cap of brass or bel1metal. v

The base A terminates at the bottom in a customary screw-threaded neck,-U, for attachment to a' pipe emanating from the boiler, or another receptacle, and

at the top in an annnlariridge or boss, D," having aA peripheral recess, d, to receive the marginal lip F of a spring-disk, E, which lip is securely gripped at every part between the concavity'G, of my cap B, and said recessed periphery D.

The rubber shield or gasket H, wliere cneis used, is of corresponding diameter to the boss D, and is tightly gripped between the top of the boss and the under side 'of' the diaphragm',

It will be seen thatl dispense entirely with the wide marginal extensions in general use hitherto, for all spring-disks employed without spiral or'otherauxiliary springs, which extend to the outside ofthe common iianges of the base and cap respectively, and' which also, like them, are required to be pierced with six or more holes, for the passage of as many bolts.

These bolts, twenty-fourtc thirty-two in number,

to wit, six to eight in each of the above-recited mem-` bers, I entirely dispense with, by the provision of the A vrecessed boss D and lip F, in connection with the described eoncavity G, and the correspondingscrewthreaded surfaces I J, on the. periphery of the base and the concavity of the capv respectively; the annu-- lar interval a'orded bythe-recess D,beiugof suicien't width and thickness to contain and firmly grip at every part ofthe marginal rim of the disk in the act of screwing down the cap. 1

K is the customary screw-neck the dial,

for attachment of In order to prevent 'any disturbance of the disk and gasket by the screwing on of the cap, Iprovide a ring L, which I call the nipping-ring, fiat-0n its under and convex on its upper side, its preponderating lower surface enabling it to remain stationary ripon the springdisk, and yet allow the cap, in rotating, to glide easily I ,over it.

L is the dial-plate, of customary for-m, screwed 'on to the capof the diaphragm-chamber, to which plate, or to a suitable frame, M, attached thereto, is journailed the usual pinion N, to whose shaft and -to said frame are attached the extremities `of the customary spiral spring 0.

Journalled at P', within the frame M, so as to gear with said pinion, is a segmental rack, P, having a heel from which rises a stud, Q, that traverses a plate, R,

' having a hinge-joint or connection, S, with a rod, T,

of customary form, whose lower end is s'wivelled to a stud, U, which rises from the 'spring-diaphragm.

Tapped within the heelP, are two setting-screws, V V', which bear uponopposite sides of the heelv of the plate R, and being one or another of them advanced, serve to press'thejoint S nearer' to or further from the journal P', so as to increase or diminish the sweep of the rack with a given deflection of the spring, diaphragm.

These screws aord a very simple means of graduating the indicating-mechanism while the gauge is in operation, withgreat'accurac'y, and without liability to derangement.

Among a number of benefits of' my invention the following may be cited:

'lhe lip F serves to hold the spring-dial much more securely and evenly than do the common bolts and anges, and is much more easily and eii'ectually -applied than if it entered in a groove,- whioh form I do not claim.

Incident to my mode of securing the downtnrned rim between the ccncavityof the cap and the recessed boss of the base, are several very decided practical advantages: f y

For example, the rim, even though it should not actually-fit the parts, is readily and eectually strained to a complete and equal hearing all around,- by the mere act of screwing down the cap -A spring-disk, not exceeding two-thirds of the area of that customarily employed, is available with the same effective area and play.

The labor and expense are avoided of gripping the flanges of the head six; or more times,'and drilling as many holes, tapping the six or more holes of the base,v and providing as many bolts.

The head inimnch lighter and cheaper, and of more compact and elegant appearance..

By'making the base of iron, and the cap of brass, the latter is, in consequence of its greater expansibility, rendered easily detachable from the former on being heated. The iron base is also more secure against leakage, being less subject to blow-holes than brass.

The nipping-rin g or washer having a preponderating lower surface to hold the spring, enables the cap to be screwed with any desired force, without shifting or disturbing the spring.

A gasket, of copper 01 other soft infnsible material, may be introduced between the diaphragm E and the nipping-ring, or even substituted for the latter; and said ring may be of any form that will aiiord a preponderating lower surface. i

While preferring iron-and brass for the base andV cap respectively, I claim the right to use any two metals whose relative thermal expansibility shall be such as to e'ect the object stated.v

I am aware that steam-pressure gauges have been proposed, having metallic rimless diaphragme sup,

1. The construction of the spring-disk of a steam pressure gauge, with the circumferential rim or liange Ii, for the purpose set forth.

.2. The oscillating segment-rack whose jointed connection with the spring-disk'or diaphragm is madeadjustable by means of the vibratablevplate R, and conical-necked setting-screws, substantially as and for the purpose set forth.

'ln testimony of which invention, I hereunto set my hand.

WILLIAM GHESLEY. Witnesses GEO. H. KNIGHT, JAMES H. LAYMAN. 

